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https://issues.jboss.org/browse/WELD-13?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12572790#comment-12572790
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Stuart Douglas commented on WELD-13:
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I don't think it is possible to have fully immutable beans, as interceptors and
decorators can be added in the AfterBeanDiscovery phase.
> Use the builder pattern to create Bean objects
> ----------------------------------------------
>
> Key: WELD-13
> URL: https://issues.jboss.org/browse/WELD-13
> Project: Weld
> Issue Type: Feature Request
> Components: Class Beans (Managed and Session)
> Reporter: Pete Muir
> Assignee: Stuart Douglas
> Priority: Critical
> Fix For: 1.2.0.Beta1
>
>
> Currently we create the Bean objects using a two phase initialization, partly
> via the constructor, and partly via an initialize() method, this allows us to
> create the beans, attach them to the bean manager and then do further work
> once all bean objects exist. This has a number of problems:
> 1) objects are not fully immutable which means we rely on developers ability
> to keep them effectively immutable
> 2) the objects are a mess of init methods and getters
> 3) creation logic is convoluted
> It would be far better to create builders (or factories) that can create the
> beans as needed, this will cleanly split out the creation logic from the bean
> object, and allow us to create fully immutable objects, thus making it easier
> to verify the thread-safety of the code.
> A side effect of this will be that we can't use two-phase initialization two
> set up certain stuff after all beans are present. To overcome this we will
> need to order the bean creation so that beans required by other beans are
> created first and thus can be attached as needed.
> The rules I am aware of:
> * producer methods and fields should be created after the class bean that
> declares them as they need to know that bean in order to be instantiated
> * specialized beans need to be created in the order least specialized to most
> specialized as a more specialized bean needs to read the metadata of the less
> specialized bean
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